Means for the attachment of parts or members to each other



Nov. 16, 1926.

' J. L. HECHT MEANS FOR THE ATTACHMENT 0F PARTS OR MEMBERS TO EACH OTHERFiled Dec. 21,

II I

I NVEN TQR.

' parts; and where,

" with the studs.

1 The aim of the present'invejntion istoob- "viate the necessity forsuch-accurate and ingor tapered walls and-is assembled flat- PatentedNov. is, 1926.

UNITED s ArEsrA'rsNr OFFICE.

" xosnrn Ii. EECHT, OF DAVENPORT, IOWA, ASSIGNOR TO FRENCH & HECHT, 0FDAVEN- r'on'r, IOWA, A FIRM comrosnnor e. WATSON FRENCH, JOSEPH L.amour, AND

, mnansroa 'rnr. nr'rao'nmnn'r or rears on; MEMBERS T0 anon o'rrmn. I 7

"a lication filed December 21,1923. Serial No. 681,909.

bers to each other, and has reference more particularly to theattachment of a plate or";

stud or studs or bolts or studs of the part to be attached, and} tosecure such fit, very accurate workmanship is necessary in theformationof the the art or member to be fastened .is to be fitte to a pluralityof vbolts or studs, not only is accurate workmanshi required inconnection with the individua studs and in fi the formationof the holesgwhichreceiv the P 3" 11136 in re -I;- 1f the-holes" exact workmanshipin the formation of the parts under the conditions mentioned, and.

to enable the parts to be quickly and firmly secured together,althoughthey "in. the hole. and; wink -re may not fit with extremeaccuracg, orf-may not register exactly with each ot er where a pluralityof bolts or studs are involved. 1 With these and other ob ects in viewmy invention consists in the combination with a bolt or stud adapted toextend through'afj hole in the part or member which is to be? attached,of a contractible member adapted to surround the-stud within said-hole,- and part which is :to be attached, is of correspondingly ta thecontractib e member into the hole bemg the form of a nut screwed on'thestud and engaging the contractible' member, so that by the cooperationof the tapered or sloping surfaces of the hole and the contractiblemember, the latter-will be wedge?i j ithest Wee -1,3

T This invention relates to nieans for" the nfirm and secure attachmentof parts or man- P r sas is frequently the ca'se','

,lglteferrihg to Figs. 1 and '2, 1 :a supportin member, in this instancein the late, and 2 designates a supportassembled 1 ered form, the meansto force;

will be drawn into firm engagement "with each other and all looseness orplay will be takenup.

"J-In the accompanying drawings:

PTFig. 1 is a. sectional elevation of two parts 7 or members involving asingle supporting stud or 'b'olt, connected together by means;

m yil lg my invention.

tractible' member and its connectedi oper'- ating amt- 1 Referring tothe drawing 2 form of a ingstuded to and projecting from the late, thesaid stud-being threaded extermember' and stud. The plate .3 is formedwithQa-circularhole Sfprovided with slopwise against the supportingplate with the holesurrounding thestu'd, with a substancalor' externallytapered split. sleeve which surrounds the studand is seated in thetapered hole, and 5 idesignatesasleeve actu- "ating means carried by thestud and operable on the contractible member to force the same I in theform ofthe invention shown comprises anut which is screwed on the stud]:and is operatively connected with the conv "-tractible member in suchmanner that in the rotary screwing and unscrewing motions of. the nut,the contractible member willfbe posie stud into the hole: The sleeveactuating means itively moved longitudinally along t ates-j IFigL72ZiQaperspective view of the nally to enable itto be fixedly connectedvwith-the plate and for the further purpose 5 presently to be described.3 designates 'a ec'ondnmember, in this instance a plate; 'hich '-is--;to--be isecured-tothe supporting without rotation thereon, suchconnection of}; the nut-with the contractible member being preferablyformed by a peripheral -shoulder'G onthe contractible member engagingloosely in an undercut groove 7' forme the nut, and constituting ineffect a swiveling connection between the nut and the'contractiblemember. a

In the use and operation of the parts described, the

plate 3 is seated against the screwedup, an theaiifisupporting plate 1,with the stud extending will be contracted on the stud and will bewedged tightly in the hole, while at the same time the parts will bedrawn together firmly,

and all lost motion or play will be taken up. Due to the swivelingconnection between the nut and the contractible member as shown, therotation of the nut in screwing or unscrewing the same, will positivelymove the I contractible member along the stud, so that the contractiblemember will be positively withdrawn from the hole when the nut isunscrewed in disassembling the parts.

From the foregoing description of the construction and operation of theparts, it will be understood that a fit of the plate 3 on the stud 2 maybe secured answering all of the purposes and advantages of a drive fit,but without the necessity of acurately forming the parts for a drivelit, the contractible' member when forced to a greater or less extentinto the hole, according to the amount of clearance, acting to wedge inthe hole and contract onthe stud, and thereby drawing the parts intofirm and tight engagement with each other. In this manner and withoutthe necessity of employing extreme accuracy of workmanship in theformation of the hole and stud, a very firm and tight connection of theparts may be secured. 1

WVhile in the case above described involving a single supporting stud,the invention possesses many valuable advantages, further advantages areobtained in cases when the part to be attached is provided with a numberof holes to receive a number of studs as is frequently required.

In the use of my invention in connection of the holes and studs is notrequired, since necessity of bringing the parts into definite and exactrelative positions, as would be the case if the member were to be fittedover the studs with a drive fit.

In the foregoing description I have set forth my invention in theparticular detailed form which I PI'BIBI'ftO adopt and which in practicehas been found to answer to a satisfactory degree the objects andadvantages to be secured, It is manifest however that various changesmay be made in the form, construction and relation of the parts withoutdeparting from the spirit of the invention.

Having thus described my invention, what I claim is:

1. In combination with a supporting member, a stud projecting therefromand provided with screw threads, a member adapted to be clamped to thesupporting member and provided with a tapered hole receiving the stud,an externally tapered unitary contractible member surrounding the studand seated in the hole and provided with a peripheral shoulder, and anut screwed on the stud and provided with an internal undercut groovereceiving the said peripheral shoulder.

2. In combination with a supporting memher, a stud projecting therefromand provided with screw threads, a member adapted to be clamped to thesupporting member and provided with a tapered hole receiving the stud,an externally tapered unitary sleeve split longitudinally to make itcontractible, said sleeve surrounding the stud and seated in said holeand provided with an external peripheral shoulder, and a nut screwed onthe stud and provided with an internal undercut groove receiving thesaid peripheral shoulder.

In testimony whereof, I have afixed my signature hereto.

- JQSEPH L, HEJHT.

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